python - 遍历由两个关键字分隔的条目的最佳方法？

Question

文本文件内容:

&CRB  A='test1'   B=123,345, 678   &END
Misc text potentially between entries ...
&CRB  A='test2'   
             B=788, 345, 3424   &END
&CRB  A='test3'   
             B=788, 345, 3424   &END
&CRB  A='test4' B=788, 345, 3424   &END

遍历关键字之间条目的最有效方法是什么？笔记一些条目跨行。需要类似以下内容 -

f = open(filename)
for entry in f:
    - do something with entry

当然没那么容易。但是，是否有关于以直接方式遍历由两个关键字分隔的条目的建议。

Answer 1

假设条目是 &CRB 和 &END 对之间的所有文本，您可以像这样提取它们之间的文本:

import re

# the regular expression treats newlines as a regular character, so the
# multiline entries are okay. It's non-greedy, so it gets individual entries.
pat = re.compile(r'&CRB(.+?)&END',  re.DOTALL)

s = ''' &CRB  A='test1'   B=123,345, 678   &END
Misc text potentially between entries ...
&CRB  A='test2'   
             B=788, 345, 3424   &END
&CRB  A='test3'   
             B=788, 345, 3424   &END
&CRB  A='test4' B=788, 345, 3424   &END'''

for entry in pat.findall(s):
   # do something with each entry
   print entry

打印这个:

 A='test1'   B=123,345, 678   
  A='test2'   
             B=788, 345, 3424   
  A='test3'   
             B=788, 345, 3424   
  A='test4' B=788, 345, 3424  

...清理和解释每条记录的内容是您的问题...